| distress signal(noun, expression, help, sign, alert) |
| Mayday(noun, information, sign, notice, alert) |
| alert(noun, sign, notice, caution, signal) |
| call for help(noun, expression, idiom, alert, alarm) |
| indication(noun, sign, notice, alert, caution) |
| admonition(noun, information, sign, notice, alert) |
| advice(noun, information, sign, notice, alert) |
| airdrop |
| alarm(noun, sign, notice, alert, device) |
| augury(noun, sign, notice, alert, caution) |
| blast(noun, alert, cry, caution, signal) |
| buzzer(noun, alert, cry, caution, signal) |
| call(noun, alert, cry, caution, signal) |
| caution(noun, sign, notice, alert, signal) |
| clock(noun, alert, cry, caution, signal) |
| cry(noun, alert, caution, signal, warning) |
| danger signal(noun, expression, alert, alarm, warning) |
| drum(noun, alert, cry, caution, signal) |
| exhortation(noun, information, sign, notice, alert) |
| flap(noun, alert, cry, caution, signal) |